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Dahasolnce [82]
3 years ago
13

Hope someone can help me with this

Mathematics
1 answer:
Norma-Jean [14]3 years ago
7 0
Hi,

To find the volume of cylinder this formula is required.

v = \pi {r}^{2} h

To get radius you need to divide diameter with 2 like this.

80 \div 2 = 40

Now just put your values into formula.

v = \pi {40}^{2}  \times 130 \\ v =653451.27

You will need 653451.27 cubic centimetres of concrete.

Hope this helps.
r3t40
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Answer:

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Step-by-step explanation:

From image we get a graphical representation of the second-order polynomial y = 4\cdot x^{2}-4\cdot x -1, where x is related to the horizontal axis of the Cartesian plane, whereas y is related to the vertical axis of this plane. Now we proceed to estimate the solutions for each case:

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There are two approximate solutions according to the graph, which are marked by red circles in the image attached below:

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b) 4\cdot x^{2}-4\cdot x -1 = 2

There are two approximate solutions according to the graph, which are marked by red circles in the image attached below:

x_{1}\approx -0.5, x_{2} \approx 1.5

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